package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否已经完成登录
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")

public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        System.out.println(Thread.currentThread().getId());

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        log.info(request.getRemoteAddr());

        //log.info("拦截到请求："+request.getRequestURI());

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        //定义不需要处理的请求路径
        String[] uris = new String[]{"/employee/login",
        "/employee/logout","/backend/**","/front/**",
        "/user/sendMsg","/user/login"};  //  backend/index.html
        //2.判断是否需要处理
        boolean check = check(requestURI, uris);
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //3.判断pc端是否已经登录
        if (request.getSession().getAttribute("employee")!=null){
            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);
            log.info("用户已经登录，id为{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }
        //判断手机端是否登录
        if (request.getSession().getAttribute("user")!=null){
            Long userid = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userid);
            log.info("用户已经登录，id为{}",request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }
        //4.如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }
    //判断路径是否需要放行方法
    public boolean check(String requestURI,String[] uris){
        for (String s : uris) {
            if (PATH_MATCHER.match(s,requestURI)){
                return true;
            }
        }
        return false;
    }
}
